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Published online 22 August 2006
Published in Soil Sci Soc Am J 70:1763-1773 (2006)
DOI: 10.2136/sssaj2006.0307
© 2006 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Right arrow Agroforestry

Agroforestry and Grass Buffer Influence on Macropore Characteristics

A Computed Tomography Analysis

Ranjith P. Udawattaa,b,*, Stephen H. Andersonb, Clark J. Gantzerb and Harold E. Garretta

a Center for Agroforestry, School of Natural Resources, Univ. of Missouri, Columbia, MO 65211
b Dep. of Soil, Environmental and Atmospheric Sciences; School of Natural Resources, Univ. of Missouri, Columbia, MO 65211


Figure 1
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  		Fig. 1. Topographic map of the agroforestry watershed with 0.5-m elevation interval contour lines (black), agroforestry buffers (gray), and sampling region (super-imposed box). Grass waterways (black) are located at the outflow end of the watershed. Agroforestry buffers consist of trees and cool season grass. The inset map shows the location of watershed in Knox County, Missouri.

 

Figure 2
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  		Fig. 2. Typical 68-mm diam. area scan images (A); after thresholding, air-filled pores are in red (B); and isolated pores within the scans (C) for the row crop, grass buffer, and tree buffer treatments.

 

Figure 3
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  		Fig. 3. Number of computed tomography-measured pores (A) and macropores (B) for crop, grass, and tree treatments at different scanning depths. Bars indicate LSD (0.05) values.

 

Figure 4
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  		Fig. 4. Computed tomography-measured macroporosity (A) and mesoporosity (B) for crop, grass and tree treatments at different scanning depths within a core. Bars indicate LSD (0.05) values.

 

Figure 5
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  		Fig. 5. The area of the largest pore at each scanned depth for crop, grass, and tree treatments. The bar indicates the LSD (0.05) value.

 

Figure 6
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  		Fig. 6. Macropore circularity values at the five scanned depths for crop, grass, and tree treatments. The bar indicates the LSD (0.05) value.

 




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